Sound-reproducing box.



l Original application led November 18, 1935, Se

l 1916. Serial JOHN e. STEURER, or NEW Yonai, N. Y.

SOUND-REPRODUCING BOX.'

To all 'Inkom t may concern; l Y t Beit kn'yvnthat I, JOHN A. STEURER, a

i citizen" of the United States, residing at gerated manner for l. the b furtl vnev , "Pred dmphragm and ew York, in

the 'county of New York and State of New York, .have invented certain body being,7 illustrated in somewhat exaggreater olearness.

3 1s an enlarged detail'view of a portion of which supports the diaragm in which the stratification is still 1er exaggerated.

Without attendant metallic tones. I

In Ycarrying out my invention, I preferabl form the sound box body of a stratiiedmaterial having 'the strata thereof ly.- ing, preferably, in planes parallel with the composed of materialA whlch 1s non-absorbent, water-proof, unaffore, never `Warp Aofy material which cold, and which will,

-or crack, and preferably combines the qualities' of a-solid quasi-vitreous y with those of a brous material.l The f 'specific lmaterial `which as 'a result of many experiments I have found to ew@ tllbestresultefis what is f Specification of Letters Patent.

desired for .as to provide the 1v mg ring', 5, whichmay be and .the collar Patented July es, 191e,

rial No. 62,126. Divided and this application tiled June 2,

known in the trade as bakelite dilecto, which is a .composite bod paper impregnated with bakelite or compositions containing bakelite and condensed or compressed to. form a substantially solid integral body, which material is obtainable in thetrade `in sheets and blocks. By the term quasi-vitreous, I mean'a material like akelite, which is hard glass-like, and of While at the same time it uniform density, is toughand not so brittle-as glass, and is ycomprising sheets of not under any integral or .external stress as l lee-to, which is turned from a gsolid block so rear Wall, 2, the diaphragm recess, 3, andfa recess, 4, of larger diameter to-'receive the diaphragm retainpreferably is made of the same material. The rear Wall, 2, is provided with theusual aperture, 6, to communicate with 'the'collar or fittings, -7 provided With secured to the a lateral flange, 8, which is body, 1, of the soundr box,

tofth being preferably provided withl the .usual '7, with its although it locking1 stud, 9. f I prefer to form the collar, ange, 8 of'4 bakelitedilecto, may be formedbf metal or other material, if desired. I also prefer to introducev a 8,' of the col- Wall of the sound box, andl to provide another Washer 11, surrounding e exteriorof the flange, 8, clamping ring, 12, engagwasher,

and; to provide a theclamping l and the' flange,

parts together with proper relation to the1 erably non-metallic,

` tion for Letters `bei g supported by gaged by pivot screws, 27,

ring being connected to the sound b oX by suitable connections as' screws, 13, passing through'aperiures in the Washers, 10 and 11, S, o the collar to secure'ihe sound box. The Washers, 10 and 11, may be of rubber, '0r l may -employ bakelite-dilecto for this purpose, and J@he clamping ring, 19 is preferably of balrelire-dilecto or other non-metailic material, although, in some instances, l may employ a metal clamping" ring, inaghich case l prefer to make the in' ner diameter of the ring-oia such a size that 1 it will noi;I come in Contact Withthe collar,

7, as shown.

15 represents the diaphragm, which is prefand preferably -formed of mica, the outer edges of the diaphragm the usual cushion rings, 16 and i7, held in place by the retaining 14, orotherwise. l prefer to pro- With he iibrous material, 21, thereof lying in planes parallel to the plane of the diaphragm, and cemented to 1she diaphragm throughout` 'the contacting surfaces thereof by a cement which is not aiected by heat, coldL moisture or einer atmospheric' condi tions. This clariying disk, however, forms no part of my presen*d invention as ii; is described and claimed in my former appl1callmed States,

Patent of the iled November 18th 1915, Serial #62,126 of which this application is a. division.

Where the sound reproducing device is used in conne'oiion with a talking machine, it will beprovided with vthe usual pivoted stylus arm, 25, of any usual or preferred formgfflie upper end being connected to the diaphragm and the lower endI provided with a-suitable recess to receive the stylus, 36, which may be held in position by a set screw', 35. The stylus arm is provided Vith a pivot engaging portion, 26, in this instance, en-

Y passing through ears, 2S, which may be secured io the sound box body .in any desired manner or 'to the retaining ring, 5.

which is connected to the body by lt Will be-seen that the body o-the sound box consists of a straiiied structure composed of fibrous material and quasi-vitreous material, as before described, arranged in AStrata parallel with Vthe diaphragm, and it is found in practice ibut my improved sound box eliminates the meallic resonance usually found in sound boxes having metallic bodies,

Whileits built-'up structure and the oombined quaiiies of die quasilvtreous and fibrous material gives it a greater degree of resonance than could be obtained with an amorphous non-metallic material, While as the same time, it is incapable of warping or cracking, and not affected by atmospheric conditions. l prefer to use ii, in cbnnection with a mica diaphragm-having the clarifying disk, Q0, covered by my former applica-- tion, but this is notesseniial, as ii/ may be used with any other form of diaphragm.

By the term bahelite as used in the 'foregoing specification and; inthe yfollowing claims, l mean a phenolic condensation product formed by combininga phenolic body vwith formaldehyde, which is best known by one of its trade names balrelite.' 1

lNhat l claim and desire ilo secureby Letters Patent is:

1. ln a sound reproducing apparatus, a. diaphragm supporting box formed of a plie nolic 'condensation product having fibrous material embedded therein.

ln a sound reproducing apparatus, a vdiaphragm supporting boa formed oi a phenolic condensation product and iibrous material in stratified relation, and having the strata 4thereof exi-ending subsrantially par-- allel with the diaphragm.

3. ln a sound. reproducing apparatus, a diaphragm supporting bei(` 'composed of bakelite having fibrous material embodied therein.

yl. In a sound reproducing apparatus,a diaphragm supporiiingY boxl composed of bakelite dilecso having thefibrous material thereof disposed in planes substantially par allel to the diaphragm. ln testimony whereof l. aiiixlmy Josu a.' soreness."

signature. 

